Dave,
The time whether it is real or fast clock doesn't matter to the program.? It is used on the printouts and is used by the operators to understand the order trains might arrive at a location.? So if the operators were using real time, they would enter real time minutes, and the same goes if they are using a fast clock, they would enter fast clock minutes.? Note that on most layouts, the time to work a location is normally much much larger than the time to travel to the next station.? On most layouts travel time to the next station is typically under a minute.? Where the time to work a single car at a location is over a minute.
Dan